x1 = int(input())
y1 = int(input())
x2 = int(input())
y2 = int(input())
x3 = int(input())
y3 = int(input())
if (((x2 - x1) ** 2) + (y2 - y1) ** 2) ** 0.5 > (((x3 - x2) ** 2) + (y3 - y2) ** 2) ** 0.5 and (((x3 - x1) ** 2) + (y3 - y1) ** 2) ** 0.5 > (((x3 - x2) ** 2) + (y3 - y2) ** 2) ** 0.5:
    print('B and C')
elif (((x2 - x1) ** 2) + (y2 - y1) ** 2) ** 0.5 > (((x3 - x1) ** 2) + (y3 - y1) ** 2) ** 0.5 and (((x3 - x2) ** 2) + (y3 - y2) ** 2) ** 0.5 > (((x3 - x1) ** 2) + (y3 - y1) ** 2) ** 0.5:
    print('A and C')
else:
    print('B and C')